Question

If x+y=3 and x-y=-1 then the value of x

Answer 1

Answer:

x=1

Step-by-step explanation:

If x+y=3 and x-y=-1 then the value of x..

Let's exclude y from the equations to find x

• x+y=3 ⇒ y=3-x
• x-y=-1 ⇒ y= x+1

Compare y from the above equations:

• 3-x=x+1
• 2x=2
• x=1

Answer 2

1st Equation:

x + y = 3

=> x = 3 - y --------------(i)

2nd Equation:

x - y = -1

=> 3 - y - y = -1 [From (i)]

=> 3 - 2y = -1

=> - 2y = -1 - 3 = -4

=> 2y = 4

=> y = 2 ------------(ii)

Now put (ii) in (i) :

x = 3 - y

=> x = 3 - 2 [From (ii)]

=> x = 1

Ans. x = 1

y= 2